@media (max-width: 750px) {
  @mixin font($size) {
    [data-dpr="1"] & {
      font-size: $size * 1;
    }
    [data-dpr="2"] & {
      font-size: $size * 2;
    }
    [data-dpr="3"] & {
      font-size: $size * 3;
    }
  }
  .song_no{
    @include font(14px);
  }
  .song_info{
    @include font(12px);
  }
  .search_box input{
    @include font(27px);
  }
  .group_title{
    @include font(24px);
  }
  .pager{
    @include font(16px);
  }
}
